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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b40ccd542c3851f964614f2515771b78a1aa8b5155281771123207139d54ef' 
  AND token = '1ppx4rOXw+3JawqKvBMQ8PdzKq8ho2dDVD2Njw23k+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}